Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc33e4be3a9a7a86…

MALICIOUS

PDF

45.7 KB Created: 2020-08-29 22:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca352644cc582ec6b760c8d31117898b SHA-1: 6b456ffc6e154d99f5893243d38acfb05ecd26c0 SHA-256: cc33e4be3a9a7a8617ffd66667b567a9726de2bcf555d985b766cfa7776bc56e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by a machine learning classifier and contains a large number of external links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/wix?keyword=chile+xcatic+wikipedia, which is likely the primary malicious payload delivery mechanism. The presence of numerous other PDF links suggests a link farm or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/wix?keyword=chile+xcatic+wikipedia
    • https://static.usrfiles.com/ugd/eda9ba_0aa6aa181ee247ca8156d711b1282faa.pdf
    • https://static.usrfiles.com/ugd/b8c837_31ab62e2ed9c4746bce29bbd0a9a6965.pdf
    • https://static.usrfiles.com/ugd/b8c837_daf709f4c772486cbde61e62e75b0001.pdf
    • https://static.usrfiles.com/ugd/b8c837_597443141cdd4dd08befe21a0b7ad014.pdf
    • https://static.usrfiles.com/ugd/16a96a_78935e39966640c9a76e69c3de7196ef.pdf
    • https://static.usrfiles.com/ugd/b8c837_da5208c95279464f8ddee75f4edd6cd7.pdf
    • https://static.usrfiles.com/ugd/299074_c9d3da42158741a4b47ffcc279a8f29e.pdf
    • https://static.usrfiles.com/ugd/97634b_f06ac313680e40f7a61a3a05783d0c8f.pdf
    • https://static.usrfiles.com/ugd/bf650e_c891d1f9dffb4d00b7f9758bbb304140.pdf
    • https://static.usrfiles.com/ugd/b8c837_e6710f2552734f3daf9a5c84df48d25f.pdf
    • https://static.usrfiles.com/ugd/b8c837_d3902005ac65449fa4739ab3008de5bf.pdf
    • https://static.usrfiles.com/ugd/b8c837_b8873021ca7949f9a9aab3c01abd3296.pdf
    • https://cdn.shopify.com/s/files/1/0433/6304/1430/files/motakiboz.pdf
    • https://cdn.shopify.com/s/files/1/0432/2210/6271/files/lofuwagasisinivu.pdf
    • https://cdn.shopify.com/s/files/1/0435/1351/2100/files/cengage_objective_physics_for_neet_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/9869/4042/files/active_passive_exercises_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0429/3502/5831/files/ctet_2020_notification_qualification.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007347.bin
ebd45522e6a8905bade99539569b670c0751c1301e277bbe27b9829af92a682f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7347 5016 bytes
font_01_sfnt_off00008461.bin
8ea9ea80723bb833b19dc5258910877274f3ca437bfcbfcc209cf5050c7b7bf0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8461 10644 bytes

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